用户环路

今天，非对称数字用户环路和光纤同轴混合网掌握着市场的主要份额，这些宽带接入技术主要采用ATM技术。

Asymmetrical Digital Subscriber Loop ( ADSL ), Hybrid Fiber-Coax ( HFC ) based on ATM technique grabbed the main market share currently .

Turbo码是一种具有极强纠错能力的差错控制编码技术，它已经被广泛地应用于诸如深空通信、移动无线传输、数字用户环路以及大容量磁存储系统等许多的领域。

Turbo code is a powerful error correcting technique that has been used in many fields such as deep space communications , wireless mobile information transmission , digital subscriber loop , and large capacity magnetic storage .

WiLL~（TM）CDMA无线用户环路系统

WiLL ~ ( TM ) CDMA Wireless Local Loop System

采用SCDMA无线用户环路技术接入IP专线电话

Adoption of SCDMA Wireless User Cycle Technology in IP Telephony

ADSL（AsymmetricDigitalSubscriberLine）不对称数字用户环路是一种在现有电话线传输高速数字信号的一种宽带接入技术。

ADSL ( Asymmetric Digital Subscriber Line ) is a broadband access technology capable of delivering large bandwidth over existing copper telephone line infrastructure .

目前，非对称数字用户环路ADSL宽带技术倍受关注。

Presently , Asymmetric Digital Subscriber Line ( ADSL ) wideband technique is paid attention to extremely .

VDSL数字用户环路的调制方法分析

The Study of the Modulation Method for VDSL Digital Subscriber Lines

ADSL（不对称数字用户环路）则是目前重要的网络接入技术。

Now , ADSL ( Asymmetric Digital Subscriber Line ) is regarded as a promising technology for access to network .

本文提出的系统尤其适合于固定无线系统和数字用户环路（DSL）。

The proposed system is of particular interest for fixed wireless systems and digital subscriber loops ( DSL ) .

第一个OFDM技术的实际应用是非对称数字用户环路（ADSL），这是一种能够通过普通电话线提供宽带数据业务的标准。

One of the first commercial systems utilizing OFDM was ADSL ( asymmetrical digital subscriber line ), a standard for high data-rate communication over twisted-pair wires .

VDSL数字用户环路接入及其关键技术

VDSL Digital Loop Access and Key Technology

超高速数字用户环路（VDSL）是利用无屏蔽铜芯双绞线传输高速数字信号的新技术。

VDSL is a new technology which transmits high-speed digital via unshielded twisted pair wire .

本文讨论无线用户环路WLL的定义、适用范围、应用现状及采用的技术。

The technology of WLL including the definition , the adaptability and the applied situation are discussed in this paper .

作为DMT调制的一项典型应用，论文重点研究了DMT调制技术在用户环路中铜双绞传输线信道上的应用。

As the typical application of the DMT , in this paper the following studies on the application of this technology in ADSL real-time communication system .

这种自适应滤波器适用于基带二线全双工传输系统，特点是可作为ISDNU-接口用户环路的回波消除器。

In addition , this adaptive filter is more suitable to the baseband fullduplex two-wire data transmission system , particularly in the ISDN U-interface subscriber loop as an echo canceller .

ADSL（非对称数字用户环路）以接入速度快、操作便捷、成本较低等独特优势，在宽带接入技术中占有举足轻重的地位。

ADSL ( Asymmetric Digital Subscriber Line ); an access fast , convenient access , lower cost and other unique advantages in the broadband access technology ; plays a decisive role .

Lite标准的非对称数字用户环路（ADSL）和甚高速数字用户环路（VDSL）都采用离散多音频（DMT）作为调制编码技术。

Lite Asymmetric Digital Subscriber Line ( ADSL ) modems and some Very-high-speed Digital Subscriber Line ( VDSL ) modems rely on discrete multitone modulation ( DMT ) .

本文较详细地介绍了非对称数字用户环路（ADSL）模拟前端的功能以及发信通道与接收信道的优化设计，可用于各种数字通信电路的设计中。

This paper introduces the function of simulators of unsymmetrical ADSL and the excellent design of sending and receiving message channels , which can be applied to many different designs of digital communication circuits .

除了流行的非对称数字用户环路、光纤同轴混合网和ATM无源光网络，学术界和工业界正日益表现出对于以太网技术应用于宽带社区接入网的巨大关注。

Apart from popular ADSL ( asymmetrical digital subscriber loop ), HFC ( hybrid fiber-coax ) and APON ( ATM passive optical network ), academic communities and industry are increasingly showing great concern about Ethernet technique in the subscriber access network .

本文研究xDSL用户环路分析仪的设计技术和实现方案，详细分析方案中的关键技术。

This paper studied the design technologies and realizing scheme of xDSL Subscriber Loop Analyzer , and analyzed the key technologies of the scheme in detail .

分析了在ISDN用户环路中2B+D接口的同步问题、各种同步方式，以及关键的技术。

The problem of synchronizer in the 2B + D interface of the ISDN digital subscriber loops is studied in this paper . Some kinds of synchronizer methods and important technology have been analyzed .

首先介绍了超高速数字用户环路（VDSL）的基本构造和线路编码，然后分析了VDSL的主要两种调制方法，即时分复用（TDD）方式和频分复用（FDD）方式。

This paper first introduces the basic structure and line code of VDSL , and then analyses two kinds of main modulation methods for VDSL , including time division du plex ( TDD ) and frequency divi-sion duplex ( FDD ) .

数字用户环路增容系统中的同步拨号方式

The Synchronized Dialling Mode in a Digital Loop Pair Gain System

用户环路光纤网结构的探讨

Inquisition on the Configurations of the Subscriber Optical Fiber Loop Network

中国数字用户环路复用系统的应用与市场

Applications and Market of Digital Subscriber Loop Multiplex ing System in China

数字用户环路中回波消除的研究及实现

Research and Implementation of Echo Cancellation in Digital Subscriber Loop

用户环路双绞线电缆故障的阶跃测试方法研究

Step Plus Test Method 's Investigation of Subscriber Loop Twisted-pair Cable Fault

电话用户环路延伸器中的回波抵消器

The Echo Canceller for the Telephone Subscriber Loop Stretcher

新型光纤用户环路传输设备的研究

Researches in New Fiber Optic Subscriber Loop Transmission Equipment

VDSL：下一代的数字用户环路技术

VDSL : The Next Generation Digital Subscriber Loop Technology